The numbers of polio cases in the world are shown in the table for various years. Year Number of Polio Cases (thousands) 1988 350 1992 138 1996 32 2000 6. 2005 3.2 2007 1.3 Let f(t) be the number of polio cases in thousands t years since 1980. Use a graphing calculator to draw a scattergram of the data. Is it better to model the data using a linear or exponential model? Exponential of Find an equation of f. Hint f(t) Round the coefficients to 4 decimal places. %3D The number of polio cases is decreasing vo by 25.59% o per year. Predict the number of polio cases in 2015. Hint Predict in which year there will be 1 case of polio. Hint Find the approximate half-life of the number of polio cases. Hint years

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